Oil pump



June 24, 1930. A, J, GIFFOQDET AL 1,765,914

I OIL PUMP 7 Original Filed Feb; 5, 1926 3 Sheets-Sheet 2 AZb e7-z fzffargi Bang 072x22 6: I Basia v June 24, 1930. A. J. GIF'FO'RD ET AL 1,765,914

OIL PUMP Original Filed Feb. 3, 1926 3 Sheets-Sheet 5 Mam if berzf fzf/ord Ben 077702 6'- 7. Eris/$0}:

Patented June '24, 1930' i ALBERT er. GIFronn Annnnmaium s. nines-er. or srmnWsBunY, iuAssAQH-Usur S,.

wnssieivons rornnanmeirronncoivimnrg on wonc'esrnn, 'MAssAcHusErrrs, A

I CORPORATION or MASSACHUSETTS j 1 orLrii uPf if i Kismet-a fi-l'ealgerua y fialm asgfise. i iie as w 19.35.; f i

:This invention relates to a pump for circulating lubricating oil andfeeding it to machine in which it to be used-on the work or tool. p 1 y I The principal objects of the invention are to provide a simple form of gear pump for this purpose having means whereby the lubricant will be introduced into the pumpand dischargedtherefrom on thesame side of the pump for saving piping and space; to provide; a bypass whereby, when 'it is desired to feed no more oil to the machine v although the machine may be running, the oil;will continue tobe circulated within the pump without being discharged; to provide simplemeans for mounting thepump and connecting it with the power, and to provide all these features in a compact form.

Reference is to be had to the accompanying drawings in which- Fig. 1 is a side view ofa drill showing a lubricating pump and connections thereon arranged in accordance with this invention;

Fig. 2 is a front view of the pump and means for operating it, showing the connectionsbetween them in central section;

'Fig. 3 is a similar view of the pump by" itself; m

Fig. 4 is an end "view of thepump;

I Fig. 5 is a central sectional View on .the line 5-. 5 of Fig. 4; V

6 is a sectional View on the line (i6 of Fig. 5

Fig. 7 is a sectional view along the line 77 of Fig. 3 through theoil outlet;

Fig. 8 is a sectional view along the line 88 of Fig. 5 showingthe' valve for controlling the by-pass; I

Fig. 9 is a viewsimilar to Fig. 2 show ng, a way of mounting thepump to "be driven by a pulley on the shaftthereof;

Fig. 10 is a side View of;a machlne like that shown in Fig. '1 showing the pump mounted to be driven dii'e'ctlyby a motor;v and Fig. 11 is a horizontal sectional View on the line 1111-of Fig. showing the connection with themotor,

This invention is designed for circulating lubricating oil in a metal working machine call attention to Fig. 9in which the" same pump casing 21 and shaft 22' a 1"e used! In thisaease the shaft 22 extends throughthe support 26 on whichthe casing21: isffi'xed means for rotat-ingit' The frame 26 can of drill 10. In Fig. 1 the'oilis drawn up from a reservoir 9 through a pipe llfthrough the pump 21 and discharged through a pipe 14; on the'workor drill.v In this case the drill is driven through a power-shaft 15 placeis li ed'a-casing which hassecured to, it the pumpca'sing 21. Y'We will not dea clutch 23 operated by a h'a ndle 24 and eccentric 25 working on a groove on theqclutch.

This clutch 22enga'ges the 'projection'180na shaft '15 to drive the pump'positi vely from that shaft. 2 f p Before describing the pump', "we wi'fll also and is provided with'a pulley 27 or other be located onithe floor orv base of-the machine we have shown itas applied to one type i i scribe the pump fully-here except-to say that i it has a shaft 22 on which is slidingly keyed for the same purposes as in the other figures.

Also in Figs 10and ll we have shown the pump 21 mounted at the base of the column .10 of the machine and operated by a motor 28 i g t directly by a'gear 29 to th on the second 7 sheet of drawings the 1 pump shaftx2 2 provided with a clutch"'23;-for

and op erating'to drive the oil throughthe course which it is designed for it to take.

The shafts of the twot gears are mounted in: the frame in 'a' well known way, a stutiing Nomatter how mounted, the pump is V constructed in the same way in all, cases. It might be stated thatin'the form shown "receiving the-projection l8, which has been box being provided to protect one of 7 them from thees'cape of oil from the pres sure side.

. -The course of the oil is from theinlet .pipe 11' throughan. inlet passage 36' at one side oi'ithe gearsfand over and around them to bring'the oil clear'from one side of the case around. the'gearslto the other side where I it enters-betweenthem, as shown in Fig; From the gears the oilf passes through .an outlet passage 37 tothe discharge pipe 14 and is drivenjout'of the pump there. It

will be noted that thepassage 37 is on the V same side ofthe] gears; as the intake end. 7 y

of the passage '36'bu'tthey are separated froin each otherle'ngthwise by an internal. The passage 86 through wall of; the casing.

in'g'with'each other for pumping Ia.liquidand means for driving one of the gear's bf a casing. surrounding the gears, said casing having an inlet passage extending from one c 7 to the inlet-side'of the gears on the 'opposite 'side of sa1d'casing, and an outlet passide thereof around one of'said gears" and lnto' a posi'tion to deliverl all of the" liquid sage from the gearsdirect and on the same side oflthe casing asthe inlet passage-{and adyacent thereto.

In testimony whereof w halvihereuntd affixed our signatures.

' the casing is also offset frornthe. entrance I .end and it is provided for use. in filling.

with a screw plug 38 Through an internal separating. wall of the casing there is an' L-shaped by-pass 40 v extending from the outletpassage. 37 into the passage 36.1 Where it enters 'tlielatter it is provided with a valveseat 41; closed by a valve 42 pressed tofits seat by a'spring ,43 and capablepf adjustment by a screvs r plug 4A.; WVhen' it is desired to shut off the I oil from the work as is often necessary or at ,least'important from thestandpoint of econ Only, this screw plug His turned outwardly V fftorrelieve the tension on the spring 43 so that thefordinary pressure of the oil in the bYz-PZISS 450 will open the valve a1. 7 oilflows from the gears throughthe'bypass 40 past theyalve 4:1 and back vintovthe j-passage 36. In this way theoil will circuscrew plug isagain adjusted to cause it to I be delivered; through the outlet pipe 14i, 7 This Constitutes a'very compact and light late continuously in the pump until the i puinp for the purpose described which can v. befilled through the'screw; plug 38 to'the oil; level indicat'edjin Fig. 6 and willthen and'space. It is capable of being applied to a tool similar to a high speed drillor i to tools of other characters in many ways as havebeen shown. w

Although we have illustrated and described onlyv asingle form of the invention and shown only three Ways, of applyingit,

Wears aware of the iact that other changes can be made therein by anyyperson skilled in the art without departing from thescope of the invention as set'forth in the claim.

Therefor fwedo not. wish, to be limited in these respects, but what we do claiin is:

continue to joperate at substantially that V t leveland which will circulate the oil in it with the machinery running when it is desired to change a tool or to replace the work. .The oil isintroduced janddischarged at the same side of the pump, thus saving piping 21 71 51 i In agear pump for a-lubricatingsystem, ythefcombination with .a pair of gears mesh- 7 

